Lightweight porous building materials



U 8 EXAMINER Patented Aug. 5, 1952 UNITED STATES PATENT OFFICE LIGHTWEIGHT POROUS BUILDING MATERIALS Herman Weber, Harriman, Tenn.

No Drawing. Application March 25, 1949,

Serial No. 83, 5 l3 3 Claims. (Cl. 106-87) 1 2 This invention relates to a non-hydrating, ga m 1 light-weight building material, such as porous By stones, porous blocks. plates, insulations, etc.. lgogatrtsnaltuaraldrgck anh an and, more particularly to products of this kind M I i manufactured from converted natural mineral 5 mug-MW) anh Pounds per Natural rock anhydrite is the starting mates e Inch rial for the manufacture of my new products, in which none or onl a minimum of water of c stallizatio'n will be present after settifig and dry- 28 firms.

It is an object of this invention to provide cmpmsmnmsism" from said material porous products in a very simple and inexpensive manner. Expausim'fi'midensity'o9 Another object of the invention is a process This density can be controlled, by varying the of manufacturing products of this kind which amounts of acid or siliceous material used to requires a minimum of treatment and handling cause the expansion. None or a very minimum of the raw material. amount of water of crystallization will be present.

Other objects and advantages of this inven- The blocks can be removed from the forms after tion will become apparent from the following six hours and are ready for use after d gin specification thereof. atmospheric storage for 8 to 10 days, or after It has been found that light-weight building being kilnlgigd at 50-80 C. for one day. The stones, plates. insulations, etc., can be manufacmaterial is sawib'liz, nailaBle, and fire resistant, tured from naturalanhydrite, ground to pass 175 and has excellent thermal and acoustical insulatmesh screen, by the evolution of g asesduring the ing properties. setting process, andTfui'the'rmore, it "hanger-i It is to be noted that in this process, no hyreuse that the'necessary gases can be developed dration of the anhydrite is intended or achieved, by the action of mineral acids, e. g., sulphuric but that the action of the acids on the siliceous acid on certain suitable siliceous material added materials produces the agents responsible for the tothe raw material. N'acc'elerator is required, binding. as the gettingagents arealso liberated from the I claim: siliceous materials with the" gasJ' 1. The process of manufacturing porous light- According to a preferred embodiment of my weight building materials. as stones, plates, invention, natural rock anhydrite (CaSOd is blocks, insulations, etc., which consists in grindground to pass a 175 mesh sieve, mixed with ap- 5 ing natural rock anhydrite to pass 175 mesh propriate amounts of suitable siliceous material screen; mixing 100 parts by weight of said ground and 2 -5 1 H solution of sulphuric acid natural rock anhydrite with about 50-80 parts (Hz 4 of siliceous material which decomposes by the ac- Suitable siliceous materials for this purpose are tlon of acid under an evolution of gas, said silior other 1g; 40 ceous material being selected from the group conor those sisting of hydrated combustion residues, fly ash, and smelter slags, cinders; and adding weak solutions of mineral acids to said mixtures.

2. The process set forth in claim 1 in which 100 parts by weight of said natural anhydrite.

acid ground to pass 175 mesh screen are mixed with utilized'can to parts of siliceous material selected from from various processes, as the group consisting of hydraulic combustion resphonation of organic compounds. idues, smelter slags, fly ash, cinders, according to When poured into molds, the mixture will ex- 5 the porosity and strength required; 2 to 5% pand due t5 the i'ormatidfi of gases and the. libaqueous sulfuric acid are added; and the resulteratlon of setting agents resulting from the acing mixture is poured into moulds for setting.

' tlon of the acid on the siliceous materials to form 3. A new anhydrous quick-setting material for porous stones, blocks, bricks, or plates suitable for the manufacture of porous light-weight building interior walls and surfaces according to the prop- 55 materials comprising parts by weight of erties noted. natural rock anhydrite. ground to pass mesh ting The 3 screen, and 50 to 80 parts of siliceous material selected from the group consisting or hydrated The following references are of record in the me of this patent:

4 UNITED STATES PATENTS Name Date Sanford July 20, 1880 Beers May 10, 1881 Brown July 30, 1912 Lefebure Sept. 27, 1932 Coxon Mar. 20, 1934 

1. THE PROCESS OF MANUFACTURING POROUS LIGHTWEIGHT BUILDING MATERIALS, AS STONES, PLATES, BLOCKS, INSULATIONS, ECT., WHICH CONSISTS IN GRINDING NATURAL ROCK ANHYDRITE TO PASS 175 MESH SCREEN; MIXING 100 PARTS BY WEIGHT OF SAID GROUND NATURAL ROCK ANHYDRITE WITH ABOUT 50-80 PARTS OF SILICEOUS MATERIAL WHICH DECOMPOSES BY THE ACTION OF ACID UNDER AN EVOLUTION OF GAS, SAID SILICEOUS MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF HYDRATED COMBUSTION RESIDUES, FLY ASH, SMELTER SLAGS, CINDERS; AND ADDING WEAK SOLUTIONS OF MINERAL ACIDS TO SAID MIXTURES. 